// Simple Blackjack implementation
const SUITS = ['♠','♥','♦','♣'];
const RANKS = ['A','2','3','4','5','6','7','8','9','10','J','Q','K'];

const dealerHandEl = document.getElementById('dealer-hand');
const playerHandEl = document.getElementById('player-hand');
const dealerValueEl = document.getElementById('dealer-value');
const playerValueEl = document.getElementById('player-value');
const balanceEl = document.getElementById('balance');
const betInput = document.getElementById('bet-input');
const betBtn = document.getElementById('bet-btn');
const currentBetEl = document.getElementById('current-bet');
const hitBtn = document.getElementById('hit');
const standBtn = document.getElementById('stand');
const doubleBtn = document.getElementById('double');
const newRoundBtn = document.getElementById('new-round');
const messageEl = document.getElementById('message');

let deck = [];
let dealer = [];
let player = [];
let dealerHidden = true;
let balance = 1000;
let currentBet = 0;
let inRound = false;

// Membuat deck kartu
function makeDeck() {
  deck = [];
  for (let s of SUITS) {
    for (let r of RANKS) {
      deck.push({ suit: s, rank: r });
    }
  }
}

// Shuffle
function shuffle() {
  for (let i = deck.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [deck[i], deck[j]] = [deck[j], deck[i]];
  }
}

// Nilai kartu
function cardValue(card) {
  if (card.rank === 'A') return 11;
  if (['J','Q','K'].includes(card.rank)) return 10;
  return Number(card.rank);
}

// Nilai total tangan
function handValues(hand) {
  let total = 0;
  let aceCount = 0;

  for (let c of hand) {
    total += cardValue(c);
    if (c.rank === 'A') aceCount++;
  }

  while (total > 21 && aceCount > 0) {
    total -= 10;
    aceCount--;
  }

  return total;
}

// Render kartu
function renderHand(container, hand, hideFirst = false) {
  container.innerHTML = '';

  hand.forEach((card, i) => {
    const div = document.createElement('div');
    div.className = 'card';

    // warna merah ♥ ♦
    if (card.suit === '♥' || card.suit === '♦') {
      div.classList.add('red');
    }

    if (hideFirst && i === 0) {
      div.className = "card back";
      div.textContent = "🂠";
    } else {
      div.innerHTML = `
        <div>${card.rank}${card.suit}</div>
        <div>${card.rank}${card.suit}</div>
      `;
    }

    container.appendChild(div);
  });
}

// Update UI
function updateUI() {
  renderHand(playerHandEl, player, false);
  renderHand(dealerHandEl, dealer, dealerHidden);

  dealerValueEl.textContent = dealerHidden ? "?" : handValues(dealer);
  playerValueEl.textContent = handValues(player);

  balanceEl.textContent = balance;
  currentBetEl.textContent = currentBet;

  hitBtn.disabled = !inRound;
  standBtn.disabled = !inRound;
  doubleBtn.disabled = !inRound;

  if (!inRound) {
    messageEl.textContent = "Pasang taruhan untuk mulai.";
  }
}

// Mulai ronde
function startRound() {
  if (inRound) return;

  const bet = Number(betInput.value);

  if (bet <= 0 || bet > balance) {
    messageEl.textContent = "Taruhan tidak valid!";
    return;
  }

  balance -= bet;
  currentBet = bet;

  makeDeck();
  shuffle();

  dealer = [deck.pop(), deck.pop()];
  player = [deck.pop(), deck.pop()];

  dealerHidden = true;
  inRound = true;

  messageEl.textContent = "Permainan dimulai!";
  updateUI();

  // Natural blackjack
  if (handValues(player) === 21) {
    playerStand();
  }
}

// Player hit
function playerHit() {
  if (!inRound) return;
  player.push(deck.pop());
  updateUI();

  if (handValues(player) > 21) {
    dealerHidden = false;
    messageEl.textContent = "Kamu bust! Dealer menang.";
    inRound = false;
    updateUI();
  }
}

// Player stand
function playerStand() {
  if (!inRound) return;

  dealerHidden = false;

  while (handValues(dealer) < 17) {
    dealer.push(deck.pop());
  }

  const pv = handValues(player);
  const dv = handValues(dealer);

  if (dv > 21 || pv > dv) {
    messageEl.textContent = "Kamu menang!";
    balance += currentBet * 2;
  } else if (pv === dv) {
    messageEl.textContent = "Seri!";
    balance += currentBet;
  } else {
    messageEl.textContent = "Dealer menang!";
  }

  currentBet = 0;
  inRound = false;
  updateUI();
}

// Double down
function playerDouble() {
  if (!inRound) return;
  if (balance < currentBet) {
    messageEl.textContent = "Saldo tidak cukup untuk double!";
    return;
  }

  balance -= currentBet;
  currentBet *= 2;

  player.push(deck.pop());
  updateUI();

  if (handValues(player) > 21) {
    dealerHidden = false;
    messageEl.textContent = "Bust saat double! Dealer menang.";
    inRound = false;
    return updateUI();
  }

  playerStand();
}

// Reset game
newRoundBtn.addEventListener('click', () => {
  balance = 1000;
  currentBet = 0;
  dealer = [];
  player = [];
  deck = [];
  inRound = false;
  dealerHidden = true;
  messageEl.textContent = "Bank di-reset.";
  updateUI();
});

// Events
betBtn.addEventListener('click', startRound);
hitBtn.addEventListener('click', playerHit);
standBtn.addEventListener('click', playerStand);
doubleBtn.addEventListener('click', playerDouble);

// Keyboard shortcut
window.addEventListener('keydown', e => {
  if (e.key === 'h') playerHit();
  if (e.key === 's') playerStand();
  if (e.key === 'd') playerDouble();
  if (e.key === 'Enter') startRound();
});

updateUI();